Departamento de Química Orgánica, Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Km 14.5 Carretera Toluca-Atlacomulco, Toluca 50200, Mexico.
Departamento de Química Orgánica, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México 04510, Mexico.
Molecules. 2023 Jan 6;28(2):569. doi: 10.3390/molecules28020569.
In this work, we provide electrochemical and spectroscopic evidence of the conducting polymer-heavy metal ion interaction by comparing the electrochemical and spectroscopic behavior (FTIR) of two different conducting polymer-modified electrodes based on 3,4-alkoxythiophenes: 3,4-ethylenedioxythiophene (EDOT) and -xylen-3,4-dioxythiophene (XDOT) during the potentiodynamic stripping of copper. By analyzing the electrochemical and spectroscopic results, it is possible to propose two different copper dissolution processes during the electrochemical stripping process, which depend on the conducting polymer used. With PEDOT matrix, stripping occurs in a two-step pathway, observed as two anodic peaks, involving the formation of the Cu-PEDOT complex and the subsequent oxidation step of the Cu complex to release Cu ions. On the other side, the experiments carried out let us propose the formation of a poorly stable Cu-PXDOT complex or a superficial mechanism for the Cu release, characterized by a single stripping signal for this process. Thus, the incorporation of Cu ions into the matrix and the stripping release are intimately related to the chemical structure of the polymer used.
在这项工作中，我们通过比较两种基于 3,4-乙氧基噻吩的不同导电聚合物修饰电极（3,4-乙二氧基噻吩（EDOT）和 -二甲氧基-3,4-噻吩（XDOT））在铜的电位动态剥离过程中的电化学和光谱行为（FTIR），提供了导电聚合物-重金属离子相互作用的电化学和光谱证据。通过分析电化学和光谱结果，可以提出在电化学剥离过程中存在两种不同的铜溶解过程，这取决于所使用的导电聚合物。在 PEDOT 基体中，剥离过程分两步进行，观察到两个阳极峰，涉及 Cu-PEDOT 配合物的形成和随后 Cu 配合物的氧化步骤以释放 Cu 离子。另一方面，进行的实验让我们提出了形成不稳定的 Cu-PXDOT 配合物或 Cu 释放的表面机制，该过程的特征是单个剥离信号。因此，将 Cu 离子掺入基质中和剥离释放与所用聚合物的化学结构密切相关。
